usr/src/lib/libc/port/i18n/wsncat.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1986 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 /*
  33  * Concatenate s2 on the end of s1. S1's space must be large enough.
  34  * At most n characters are moved.
  35  * return s1.
  36  */
  37
  38 #pragma weak _wcsncat = wcsncat
  39 #pragma weak _wsncat = wsncat
  40
  41 #include "lint.h"
  42 #include <stdlib.h>
  43 #include <wchar.h>
  44
  45 wchar_t *
  46 wcsncat(wchar_t *s1, const wchar_t *s2, size_t n)
  47 {
  48         wchar_t *os1 = s1;
  49
  50         while (*s1++) /* find end of s1 */
  51                 ;
  52         ++n;
  53         --s1;
  54         while (*s1++ = *s2++) /* copy s2 to s1 */
  55                 if (--n == 0) {  /* at most n chars */
  56                         *--s1 = 0;
  57                         break;
  58                 }
  59         return (os1);
  60 }
  61
  62 wchar_t *
  63 wsncat(wchar_t *s1, const wchar_t *s2, size_t n)
  64 {
  65         return (wcsncat(s1, s2, n));
  66 }